8000 bpo-14879: [doc] clarify how to check for errors from subprocess.Popen(..., shell=True) by jdevries3133 · Pull Request #26755 · python/cpython · GitHub
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bpo-14879: [doc] clarify how to check for errors from subprocess.Popen(..., shell=True) #26755

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Merged
merged 5 commits into from
Jul 22, 2021
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bpo-14879: [doc] clarify how to check for errors from subprocess.Popen(..., shell=True) #26755

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5a33651
bpo-14879: [doc] subprocess shell=True OSError may not be raised
jdevries3133 Jun 16, 2021
2cd5b21
bpo-14879: fix line wrapping in response to review
jdevries3133 Jun 21, 2021
d1b4dac
bpo-14879: enforce 80 char columns throughout subprocess.rst
jdevries3133 Jun 21, 2021
ee3ef86
Revert "bpo-14879: enforce 80 char columns throughout subprocess.rst"
jdevries3133 Jun 21, 2021
519ade3
minor rewording.
iritkatriel Jun 21, 2021
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5 changes: 4 additions & 1 deletion Doc/library/subprocess.rst
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Expand Up @@ -689,7 +689,10 @@ execute, will be re-raised in the parent.

The most common exception raised is :exc:`OSError`. This occurs, for example,
when trying to execute a non-existent file. Applications should prepare for
:exc:`OSError` exceptions.
:exc:`OSError` exceptions. Note that, when ``"shell=True"``, :exc:`OSError`
will be raised by the child only if the selected shell itself was not found.
To determine if the shell failed to find the requested application, it is
necessary to check the return code or output from the subprocess.

A :exc:`ValueError` will be raised if :class:`Popen` is called with invalid
arguments.
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